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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 48 |
| 3 | 765 |
| 4 | 12192 |
| 5 | 194307 |
| 6 | 3096720 |
| 7 | 49353213 |
| 8 | 786554688 |
| 9 | 12535521795 |
| 10 | 199781794032 |
| 11 | 3183973182717 |
| 12 | 50743789129440 |
| 13 | 808716652888323 |
| 14 | 12888722657083728 |
| 15 | 205410845860451325 |
| 16 | 3273684811110137472 |
| 17 | 52173546131901748227 |
| 18 | 831503053299317834160 |
[0,3,48,765,12192,194307,3096720,49353213, 786554688,12535521795,199781794032,3183973182717, 50743789129440,808716652888323,12888722657083728, 205410845860451325,3273684811110137472, 52173546131901748227,831503053299317834160] |